Abstract：Based on modulation theorem, theoretical study was carried out to obtain the input power fluctuation of the fluorescent lamp (FL) with self-oscillating electronic ballast supplied by voltages including interharmonics. And the relationship between characteristics of FL’s instantaneous power fluctuation and interharmonics is established. The simulation and experimental results confirm that the proposed methods are valid. Both theoretical and experimental results show that the interharmonic component included in supply voltage indeed leads flicker of FLs and the flicker frequency equals the voltage fluctuation frequency caused by interharmonics. The established relationship between FL’s instantaneous power fluctuation and interharmonics is helpful to further research on the evaluating flicker effect of interharmonics on FLs and framing the flicker limit standard of interharmonics.
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